Absolute Maximum Ratings table in datasheet suggests that Voltage on any I/O Pin or RST with respect to GND can be upto 5.8V. Which indirectly implies that the Input pins are 5.0V tolerant and can be connected with microcontroller or embedded boards running at 5.0V without requiring voltage level translation.

Download STC single victory over PL2303 scheme, maximum download speeds of up to 115200 baud rate.

Note: the USB to serial port can be used more than STC-ISPV3.94 version download old version of STC MCU STC89C and STC12C ( LE ) series ( the new version of chip can not download, users will download the software on the highest and lowest baud rate settings for the same can download ( 1200), we can not do that, please consider)

CP2102 Description:

CP2102 USB to serial chip silbab developed, compact, peripheral does not require any element can be enough to become one of the most simple USB-UART program, the communication rate of up to 1Mbps serial products easily upgrade to the USB port, but because of its small size, while MLP package, welding some technical difficulty, so the owner designed this compact USB-UART modules, and leads to the interface, including 5V, 3.3V, TXD, RXD, GND, which TXD, RXD can directly pick a the MCU serial convenient for early debugging, even 3.3V systems from the module to take power (less than 100mA) LED display module is powered on and working properly.